DF2437FV Renesas Electronics America, DF2437FV Datasheet - Page 389

• Manufacturer Part Number: DF2437FV
• Description: IC H8S/2437 MCU FLASH 128QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2400r

Specifications of DF2437FV

• Core Processor: H8S/2600
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: I²C, SCI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 85
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 16x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 128-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

12.5.4
In cascaded operation, two 16-bit counters for different channels are used together as a 32-bit
counter.
This function works by counting the channel 1 counter clock at overflow/underflow of TCNT_2 as
set in bits TPSC2 to TPSC0 in TCR.
Underflow occurs only when the lower 16-bit TCNT is in phase counting mode.
Table 12.18 shows the register combinations used in cascaded operation.
Note: When phase counting mode is set for channel 1, the counter clock setting is invalid and the
Table 12.18 Cascaded Combinations
Combination
Channels 1 and 2
Example of Cascaded Operation Setting Procedure:
Figure 12.21 shows an example of the setting procedure for cascaded operation.
Examples of Cascaded Operation:
Figure 12.22 illustrates the operation when counting upon TCNT_2 overflow/underflow has been
set for TCNT_1, TGRA_1 and TGRA_2 have been designated as input capture registers, and the
TIOC pin rising edge has been selected.
counter operates independently in phase counting mode.
Cascaded Operation
<Cascaded operation>
Cascaded operation
Figure 12.21 Cascaded Operation Setting Procedure
Set cascading
Start counting
Upper 16 Bits
TCNT_1
[1]
[2]
[1]
[2]
Set bits TPSC2 to TPSC0 in the channel 1 TCR
to B'111 to select TCNT_2 overflow/underflow
counting.
Set the CST bit in TSTR for the upper and lower
channel to 1 to start the count operation.
Lower 16 Bits
TCNT_2
Rev.2.00 May. 28, 2009 Page 349 of 732
REJ09B0059-0200